Description

Park Tool’s BBT-59 Bottom Bracket Tool is a precision CNC machined aluminum tool designed to remove and install 16-notch external bearing bottom brackets. The BBT-59 features a ratchet wrench compatible with a 3/8" drive and its anodized for easy identification.

I bought this to install Shimano Ultegra 6800 and XT8000 bottom bracket cups, which have a unique spline pattern. Like all Park tools, this is a solid piece of work. However, you need a 38 driver to use it, and I'm not sure it works substantially better than the plastic adapters that Shimano ships with their bottom brackets. Overall, this tool is another unitasker that costs more than the component and will be obsolete in 2 years when the component design changes yet again.